Re: It's been 12 hours and iOS still hasn't finished updating. What can I do?

Not in my experience. If you're updating OTA (over the air), it could take a while depending on your internet connection and the same applies via iTunes. You might consider downloading the .ipsw file for the latest iOS version and install it manually via iTunes.

Re: It's been 12 hours and iOS still hasn't finished updating. What can I do?

I'm exactly having the same situation here right now! What to do???? It's been an entire night! I'm awake now in the morning and myphone's still showing me the white screen with black apple in the center, then it switches to blue screen and die for 2 secs and repeat. What's wrong with my phone?? Why it's taking it so long to update??? Help please!!